Thermal conductivity and thermal diffusivity of selected oxide single crystals
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Values for the thermal conductivity kappa and the thermal diffusivity D of four oxide single crystals were obtained. Near room temperature, the values for kappa (W cm(-1) K-1) and D (cm(2) s(-1)) are as follows: LaAlO3, kappa = 0.115, D = 0.0446; NdGaO3, kappa = 0.068, D = 0.0197 for one structural orientation, and kappa = 0.059, D = 0.0195 for an orthogonal orientation; (LaAlO3)(0.3)-SrAl0.5Ta0.5O3, kappa = 0.051, D = 0.0133; and, ScAlMgO4, kappa = 0.062, D = 0.0229. The relative standard uncertainties in these values are +/-10% (1 sigma). These values allowed us to calculate the specific heat of the materials. The thermal conductivity was measured by a dc heated bar method, and the thermal diffusivity was measured by a modification of Angstroms method.